Zr-Cu-Fe-Al合金的非晶形成能力、热稳定性及组织结构特征  

Glass Forming Ability,Thermal Stability and Microstructure Characteristics of Zr-Cu-Fe-Al Alloy

作　　者：孙小钧 江鸿翔[1] 张丽丽[1] 赵九洲[1,2] 何杰 Sun Xiaojun;Jiang Hongxiang;Zhang Lili;Zhao Jiuzhou;He Jie(Shi-changxu Innovation Center for Advanced Materials,Institute of Metal Research,Chinese Academy of Sciences;School of Materials Science and Engineering,University of Science and Technology of China)

机构地区：[1]中国科学院金属研究所师昌绪先进材料创新中心,沈阳110016 [2]中国科学技术大学材料科学与工程学院

出　　处：《特种铸造及有色合金》2021年第1期16-22,共7页Special Casting & Nonferrous Alloys

基　　金：国家自然科学基金资助项目(51774264,51974288,51574216);辽宁省自然科学基金资助项目(2019-MS-332)。

摘　　要：采用铜模铸造法制备了Zr-Cu-Fe-Al非晶合金,利用X射线衍射仪、差热分析仪及高分辨透射电镜,系统研究了Al含量和Cu与Fe摩尔比对Zr59(Cu0.5Fe0.5)33Al8合金的非晶形成能力、热稳定性及组织结构的影响。结果表明,随着Al含量增加,Zr59(Cu0.5Fe0.5)41-xAlx和Zr67-x(Cu0.5Fe0.5)33Alx合金的非晶形成能力均呈现先增加后降低的趋势。对于Zr59(Cu1-xFex)33Al8合金,当Cu与Fe摩尔比在5∶5~8∶2之间时,合金非晶形成能力较好。γ参数及晶化温度研究表明,Zr59(Cu0.7Fe0.3)33Al8合金具有大的非晶形成能力及高的热稳定性。此外,Zr59(Cu0.5Fe0.5)33Al8合金的HRTEM结果表明,由于Cu与Fe混合焓为正,在快速冷却条件下,合金将会发生液-液相分离,形成富Fe和富Cu两液相,之后两液相分别发生玻璃转变,最终形成高数量密度的纳米富Fe非晶粒子分布在富Cu非晶基体上的组织结构。The Zr-Cu-Fe-Al amorphous alloy was prepared by copper mold casting.The effects of the Al content and atomic ratio of Cu to Fe on the glass forming ability(GFA),thermal stability and microstructure were investigated by X-ray diffractometer,differential thermal analyzer and high-resolution transmission electron microscopy.The results reveal that the GFA of both Zr59(Cu0.5Fe0.5)41-xAlxand Zr67-x(Cu0.5Fe0.5)33Alxalloy are firstly increased and then decreased with the increase of the Al content.For Zr59(Cu1-xFex)33Al8alloy,the glass forming ability is a better when the atomic of Cu to Fe is between 5∶5and 8∶2.Theγparameter and crystallization temperature indicate that Zr59(Cu0.7Fe0.3)33Al8alloy exhibits the excellent GFA and high thermal stability.Moreover,the HRTEM result of Zr59(Cu0.5Fe0.5)33Al8alloy indicates that due to the positive enthalpy between Cu and Fe,the alloy undergoes liquid-liquid phase separation during the rapid cooling,forming Cu-rich and Fe-rich liquid phases and then liquid-glass transition occurs,resulting in phase separation nanocrystals in which glassy Fe-rich nanoparticles with high number density are distributed on the glassy Cu-rich matrix.

关 键 词：非晶形成能力 热稳定性 组织结构 液-液相分离 

分 类 号：TG146.414[金属学及工艺—金属材料] TG139.8[金属学及工艺—金属学]